src/PassGenerate.java - master - NikolayIvkin/java_course1

src/PassGenerate.java
59 строк2 KB
alex89
Initial commit.
20 сен 2024, 07:51
20 сен 2024, 07:51d6e240c
import java.util.Scanner;

public class PassGenerate {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n;
        String upperCase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        String lowerCase = "abcdefghijklmnopqrstuvwxyz";
        String digits = "0123456789";
        String symbols = "*-_";
        String password;

        while (true) {
            System.out.print("Введите длину пароля: ");
            n = sc.nextInt();
            if (n >= 8) {
                break;
            } else {
                System.out.println("Пароль с " + n + " количеством символов небезопасен");
            }
        }

        while (true) {
            StringBuilder pass = new StringBuilder();
            generatePassword(n, upperCase, lowerCase, digits, symbols, pass);
            password = pass.toString();
            if (password.matches(".*[A-Z].*") &&
                    password.matches(".*[a-z].*") &&
                    password.matches(".*[0-9].*") &&
                    password.matches(".*[_\\*-].*")) {
                break;
            }
        }

        System.out.println("Сгенерированный пароль: " + password);
    }

    public static void generatePassword(int n, String upperCase, String lowerCase, String digits, String symbols, StringBuilder pass) {
        for (int i = 0; i < n; i++) {
            int index = (int) (Math.random() * 4);
            if (index == 0) {
                int indexInMas = (int) (Math.random() * upperCase.length());
                pass.append(upperCase.charAt(indexInMas));
            }
            if (index == 1) {
                int indexInMas = (int) (Math.random() * lowerCase.length());
                pass.append(lowerCase.charAt(indexInMas));
            }
            if (index == 2) {
                int indexInMas = (int) (Math.random() * digits.length());
                pass.append(digits.charAt(indexInMas));
            }
            if (index == 3) {
                int indexInMas = (int) (Math.random() * symbols.length());
                pass.append(symbols.charAt(indexInMas));
            }
        }
    }
}